During the years after the demolition of Bishop Absalon's castle by the Hansa League in 1369, the ruins on the island were covered with earthworks, on which the new stronghold, Copenhagen Castle, was built. The castle had a curtain wall and was surrounded by a moat and with a large, solid tower as an entrance gate. The castle was still the property of the Bishop of Roskilde until King Eric of Pomerania usurped the rights to the castle in 1417. From then on the castle in Copenhagen was occupied by the king.